Edit config.inc.php to give a value (any string of max 46 characters) to $cfg['blowfish_secret'] = ''; that is used when $cfg['Servers'][$i]['auth_type'] = 'cookie';. Also add the lines $cfg['Servers'][$i]['socket'] = '/var/run/mysql/mysql.sock'; & $cfg['Servers'][$i]['connect_type'] = 'socket';. After that it should be possible to open page http://localhost/phpmyadmin using your browser.